increase reporting performance of a report with lots of cell definitions

Hi all,

In one of our queries (3.5), we had to use lots of cell definition. And after execution of the report, it stays in "Formatting Result Area" and "Retrieving Result from BW Server" for a very long time (about 30 minutes).

There is already aggregate on the infoprovider and report uses it.

Is there any way to increase reporting performance of a report with lots of cell definitions ?

Thanks

SP